The queen's post said: "In the letter, Babbage told Queen Victoria and Prince Albert about his invention, the Analytical Engine, upon which the first computer programs were created by Ada Lovelace, a daughter of Lord Byron. "

The royal Instagram account was launched in 2013 and has 4.6 million followers.

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Queen Elizabeth and her matching umbrellas

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Queen Elizabeth and her matching umbrellas

Queen Elizabeth II shelters from the rain under an umbrella in the garden of Buckingham Palace, as up to 8,000 guests attend the first royal garden party of the year, in London, Britain May 10, 2016. REUTERS/John Stillwell/Pool Photograph taken May 10, 2016.

Britain's Queen Elizabeth leaves after attending the Christmas Day service at church in Sandringham, eastern England, December 25, 2015. REUTERS/Peter Nicholls

Britain's Queen Elizabeth leaves after attending the Christmas Day service at church in Sandringham, eastern England, December 25, 2015. REUTERS/Peter Nicholls

Britain's Queen Elizabeth holds an umbrella as she stands in the rain during her visit to Lancaster Castle in Lancaster, Britain May 29, 2015. REUTERS/Andrew Yates

Britain's Queen Elizabeth carries an umbrella, to protect her from the
torrential rain, before inspecting members of the 1st Battalion The
Royal Scots (Royal Regiment) at the traditional Ceremony of the Keys
outside the Palace of Holyroodhouse in Edinburgh, July 1, 2003. The
Queen is in Scotland to commemorate the 400th anniversary of the Union
of the Crowns - when King James VI of Scotland became King James I of
England following the death of Queen Elizabeth I. REUTERS/Andrew
Parsons/POOL
MD

Britain's Queen Elizabeth (R) carrying an umbrella to protect her from
the torrential rain, inspects members of the 1st Battalion The Royal
Scots (Royal Regiment) at the traditional Ceremony of the Keys outside
the Palace of Holyroodhouse in Edinburgh, July 1, 2003. The Queen is in
Scotland to commemorate the 400th anniversary of the Union of the
Crowns - when King James VI of Scotland became King James I of England
following the death of Queen Elizabeth I. REUTERS/Andrew Parsons/POOL
MD

Britain's Queen Elizabeth II inspects the Regiment during a ceremony to present new colours to the 1st Battalion and F Company Scots Guards at Buckingham Palace in London on May 18, 2017. / AFP PHOTO / POOL / John Stillwell (Photo credit should read JOHN STILLWELL/AFP/Getty Images)

Queen Elizabeth II during a garden party at Buckingham Palace on May 16, 2017 in London, England. (Photo by Victoria Jones - WPA Pool /Getty Images)

BIRMINGHAM, UNITED KINGDOM - NOVEMBER 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II shelters under an umbrella as she visits the newly redeveloped Birmingham New Street Station on November 19, 2015 in Birmingham, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - OCTOBER 25: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II shelters under an umbrella as attends the opening of the newly developed Jubilee Gardens on October 25, 2012 in London, England. (Photo by Indigo/Getty Images)

LONDON, UNITED KINGDOM - OCTOBER 25: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II shelters under an umbrella as attends the opening of the newly developed Jubilee Gardens on October 25, 2012 in London, England. (Photo by Indigo/Getty Images)

RICHMOND, UNITED KINGDOM - MARCH 15: Queen Elizabeth II shelters under an umbrella as she visits the 'Wild London' exhibition with Prince Philip, Duke of Edinburgh on May 15, 2012 in Richmond, England. (Photo by Suzanne Plunkett - WPA Pool/Getty Images)

RICHMOND, UNITED KINGDOM - MARCH 15: Queen Elizabeth II struggles with an umbrella during a hailstorm as she visits the 'Wild London' exhibition with Prince Philip, Duke of Edinburgh on May 15, 2012 in Richmond, England. (Photo by Suzanne Plunkett - WPA Pool/Getty Images)

MERTHYR, WALES - APRIL 26: Queen Elizabeth II holds an umbrella during a rain shower as she visits Cyfarthfa High School and Castle on April 26, 2012 in Merthyr, Wales. The Queen and Duke of Edinburgh are on a two day visit to Wales as part of their Diamond Jubilee tour of the country. (Photo by Chris Jackson WPA - Pool/Getty Images)

MERTHYR, WALES - APRIL 26: Queen Elizabeth II holds an umbrella during a rain shower as she visits Cyfarthfa High School and Castle on April 26, 2012 in Merthyr, Wales. The Queen and Duke of Edinburgh are on a two day visit to Wales as part of their Diamond Jubilee tour of the country. (Photo by Chris Jackson WPA - Pool/Getty Images)

Britain's Queen Elizabeth II shelters from the rain under an umbrella as she hosts a garden party at Buckingham Palace, in central London. (Photo by Dominic Lipinski/PA Images via Getty Images)

Britain's Queen Elizabeth II shelters from the rain under an umbrella as she hosts a garden party at Buckingham Palace, in central London. (Photo by Dominic Lipinski/PA Images via Getty Images)

CASTLE DOUGLAS - UNITED KINGDOM - JULY 14: Queen Elizabeth II looks out from under an umbrella whilst visiting Wallets Marts, where she observed sheep shearing, on July 14, 2010 in Castle Douglas, Galloway, Scotland. The Queen and Duke of Edinburgh met members of the farming community and attended a livestock show while touring rural Dumfries and Galloway. (Photo by Andrew Milligan - WPA Pool/Getty Images)

Queen Elizabeth II takes shelter under her umbrella, as she and the Duke of Edinburgh arrive at the Garrison in Halifax, Nova Scotia, Canada, at the start of her nine-day tour of the the country. (Photo by John Stillwell/PA Images via Getty Images)

HALIFAX, NS - JUNE 28: Queen Elizabeth II arrives at the Garrison on June 28, 2010 in Halifax, Canada. The Queen and Duke of Edinburgh are on an eight day tour of Canada starting in Halifax and finishing in Toronto. The trip is to celebrate the centenary of the Canadian Navy and to mark Canada Day. The royal couple will make their way to New York where the Queen will address the UN and visit Ground Zero on July 6. (Photo by John Stillwell - WPA Pool/Getty Images)

The Queen With The Duke Of Edinburgh And Princess Alexandra At The 2009 Derby Festival At Epsom Racecourse. (Photo by Mark Cuthbert/UK Press via Getty Images)

BURSA - MAY 14: Queen Elizabeth ll takes shelter under an umbrella and wears a headscarf as a mark of respect when she visits the Green Mosque complex on the second day of a state visit to Turkey on May 14, 2008 in Bursa, Turkey. (Photo by Anwar Hussein/WireImage)

BELFAST, NORTHERN IRELAND - OCTOBER 6: (NO PUBLICATION IN UK MEDIA FOR 28 DAYS) Queen Elizabeth ll chats with disabled soldiers of the Royal Irish Regiment and their families on October 6, 2006 in Belfast, Northern Ireland. (Photo by Pool/Anwar Hussein Collection/Getty Images)

LONDON - MARCH 29: (NO PUBLICATION IN UK MEDIA FOR 28 DAYS) Queen Elizabeth ll shelters under an umbrella as she visits the new National Tennis Centre in Roehampton on March 27, 2007 in London, England. (Photo by Pool/Anwar Hussein Collection/Getty Images)